If the Search Division considers that the European patent application does not comply with the provisions of the Convention to such an extent that it is not possible to carry out a meaningful search into the state of the art on the basis of all or some of the claims, it shall either declare that search is not possible or shall, so far as is practicable, draw up a partial European search report. The declaration and the partial report referred to shall be considered, for the purposes of subsequent proceedings, as the European search report.